Black quartz glass and method for producing same

Abstract

The present invention relates to a black quartz glass consisting of a composition comprising 63 to 65 mass % of SiO2, 18 to 24 mass % of TiO2, and 12 to 17 mass % of Al2O3, wherein the sum of SiO2, TiO2 and Al2O3 is 100 mass %; and to a method for producing black quartz glass comprising: mixing 63 to 65 mass % of a SiO2 powder, 18 to 24 mass % of a TiO2 powder and 12 to 17 mass % of an Al2O3 powder, filling the mixed powder into a mold and then melting at a maximum temperature of 1700 to 1900° C. in an oxygen-free atmosphere, and cooling to room temperature to obtain the black quartz glass; and further to a product comprising a black quartz glass member made of the black quartz glass. The present invention allows to provide a black quartz glass which has an excellent light-shielding property, has no risk of causing contamination in a step of using it, has sufficient color uniformity when the size is enlarged, and is capable of producing a large ingot, and to provide a method for producing the black quartz glass with excellent productivity even in the large ingot, and to provide a black quartz glass product made of the black quartz glass.

Dependencies are inferred from the claim text.